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Schweitzer Engineering Laboratories SEL-151, Instruction Manual

The Schweitzer Engineering Laboratories SEL-151 Instruction Manual is your comprehensive guide to efficiently operate and maximize the potential of your SEL-151 product. Download this manual for free from our website and unlock the full potential of your SEL-151 device.

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Summary of Contents for SEL-151

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Page 5: ... 50M 51QP 50Q 51NP 50NL 50NH R2 51T 50LT 50MT 51QT 50QT 51NT 50NLT 50H R3 21P 50C 27 52AT 52BT IN6 IN5 R4 PDEM QDEM NDEM TF CF TCMA ST R5 A B C D E F G H R6 J KT L V W X Y ZT Note 50H 50C and 27 are in different locations in each Relay Word 79RS 79CY 79LO and 79SH are not in the SEL 151C Relay Word because the SEL 151C relay does not include a reclosing relay The SEL 151C relay has an extra defini...

Page 6: ...t Report Column Elements Asserted Symbol Displayed 50M 50M 50MT 0 0 0 1 not possible 1 0 p 1 1 t The 50H element cannot be torque controlled in the SEL 151C relay so the 50H column appears to the right of the TCI torque control internal column in the event report The 50M and 50MT elements can be torque controlled The SEL 151C relay has three single zone self polarized mho distance elements 21AB 21...

Page 7: ... and 21P Therefore you should be careful to set the relay so that under normal conditions none of these elements are picked up In the event reports of both relays the TCI column displays these symbols This column allows you to monitor internal torque controlling elements in the event report Event Report Column Elements Asserted Symbol Displayed TCI 21P 50C 27 0 0 0 0 Rows 1 4 are symbols 0 0 1 V f...

Page 8: ...rsion specifications are interpreted as follows V VS V ABCDEFG Option Specifier Specifier Meaning Option Description A 5 6 50 Hz 60 Hz Power System Frequency B 1 5 1 amp 5 amps Nominal Amps per Phase C 6 120 67 volts Nominal Volts per Phase D n none Fault Locator type E p n positive negative Phase Sequence of Power System F 0 none Recloser G e enable and alarm Target LEDs Figure 1 SEL 151C Relay T...

Page 9: ...Date Code 910703 SEL 151C Addendum A 5 SEL 151 Instruction Manual Figure 2 SEL 151C Distribution Bus Relay Horizontal Front and Rear Panel Drawings ...

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Page 94: ... test fails the IC socket number of the defective part replaces OK The A D self test checks analog to digital conversion time The MOF test checks dc offset in the MUX PGA A D circuit The SET self test calculates a checksum of the settings stored in nonvolatile memory and compares it to the checksum calculated when the settings were last changed Section 2 SPECIFICATIONS provides full definitions of...

Page 95: ...M Output Contacts These selections are useful in testing checking contact states and reading targets remotely 1 indicates an asserted element 0 indicates a deasserted element The optional command parameter k selects the number of times the relay displays target data for parameter n The example below shows a series of ten target readings for Relay Word row R3 Target headings repeat every eight rows...

Page 96: ...vel Targets remain in the specified level if you assign the AUTO setting to a port with zero timeout or set both TIME1 and TIME2 to zero This halts automatic message transmission to a port which may be timed out TARGET R You can reset front panel targets to TAR 0 and clear them remotely or locally with the TARGET R command Type TARGET R ENTER to reset and clear the targets as shown in the followin...

Page 97: ... pulses the ALARM contacts closed for one second after any Level 2 access attempt CLOSE The CLOSE command asserts the CLOSE output relay when jumper JMP104 is installed on the main board the circuit breaker status input 52A 52A 52AR or 52AR indicates an open circuit breaker and the TRIP outputs are not asserted The CLOSE output relay then remains closed until the circuit breaker status input indic...

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Page 146: ...5 18 Applications Date Code 921113 SEL 151 Instruction Manual Figure 5 9 Phase To Phase Fault on Delta Wye Transformer Secondary ...

Page 147: ...nto IN5 or IN6 Using SELOGIC Control Equations K 1234 IN5 Figure 5 10 Input IN5 Qualified by Time TKPU Time TKPU qualifies the underfrequency input condition Continuing with SELOGIC Control Equations TR 1246 KT TR is the programmable trip condition close TRIP output contacts TR Relays on different feeders can have different TKPU time delay pickup settings so certain feeders are tripped before othe...

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